From 24e6ac1659defa5cd8c60edde0392b3685f460a2 Mon Sep 17 00:00:00 2001
From: Jose <pepone@users.noreply.github.com>
Date: Mon, 18 Sep 2023 17:07:45 +0200
Subject: [PATCH] Remove loopback fastpath - Fix #1480 (#1508)

---
 cpp/src/Ice/Network.cpp   | 40 ---------------------------------------
 csharp/src/Ice/Network.cs | 27 --------------------------
 2 files changed, 67 deletions(-)

diff --git a/cpp/src/Ice/Network.cpp b/cpp/src/Ice/Network.cpp
index 4e42cafc811..ccf78cc66bd 100644
--- a/cpp/src/Ice/Network.cpp
+++ b/cpp/src/Ice/Network.cpp
@@ -54,12 +54,6 @@
 #  pragma GCC diagnostic ignored "-Wmissing-field-initializers"
 #endif
 
-#if defined(_WIN32)
-#   ifndef SIO_LOOPBACK_FAST_PATH
-#       define SIO_LOOPBACK_FAST_PATH _WSAIOW(IOC_VENDOR,16)
-#   endif
-#endif
-
 #if defined(__MINGW32__)
 //
 // Work-around for missing definitions in MinGW Windows headers
@@ -182,28 +176,6 @@ setKeepAlive(SOCKET fd)
     }
 }
 
-#if defined(_WIN32)
-void
-setTcpLoopbackFastPath(SOCKET fd)
-{
-    int OptionValue = 1;
-    DWORD NumberOfBytesReturned = 0;
-
-    int status =
-        WSAIoctl(fd, SIO_LOOPBACK_FAST_PATH, &OptionValue, sizeof(OptionValue), ICE_NULLPTR, 0, &NumberOfBytesReturned, 0, 0);
-    if(status == SOCKET_ERROR)
-    {
-            // On platforms that do not support fast path (< Windows 8), WSAEONOTSUPP is expected.
-        DWORD LastError = ::GetLastError();
-        if(LastError != WSAEOPNOTSUPP)
-        {
-            closeSocketNoThrow(fd);
-            throw SocketException(__FILE__, __LINE__, getSocketErrno());
-        }
-    }
-}
-#endif
-
 SOCKET
 createSocketImpl(bool udp, int family)
 {
@@ -226,18 +198,6 @@ createSocketImpl(bool udp, int family)
     {
         setTcpNoDelay(fd);
         setKeepAlive(fd);
-
-#if defined(_WIN32)
-        //
-        // FIX: the fast path loopback appears to cause issues with
-        // connection closure when it's enabled. Sometime, a peer
-        // doesn't receive the TCP/IP connection closure (RST) from
-        // the other peer and it ends up hanging. This is showing up
-        // with the background test when ran with WS. The test
-        // sporadically hangs on exit. See bug #6093.
-        //
-        //setTcpLoopbackFastPath(fd);
-#endif
     }
 
     return fd;
diff --git a/csharp/src/Ice/Network.cs b/csharp/src/Ice/Network.cs
index dcd4f0e1c74..afceeae84db 100644
--- a/csharp/src/Ice/Network.cs
+++ b/csharp/src/Ice/Network.cs
@@ -237,13 +237,6 @@ public static Socket createSocket(bool udp, AddressFamily family)
                 {
                     setTcpNoDelay(socket);
                     socket.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.KeepAlive, 1);
-                    //
-                    // FIX: the fast path loopback appears to cause issues with
-                    // connection closure when it's enabled. Sometime, a peer
-                    // doesn't receive the TCP/IP connection closure (RST) from
-                    // the other peer and it ends up hanging. See bug #6093.
-                    //
-                    //setTcpLoopbackFastPath(socket);
                 }
                 catch(SocketException ex)
                 {
@@ -318,26 +311,6 @@ public static void setTcpNoDelay(Socket socket)
             }
         }
 
-        //
-        // FIX: the fast path loopback appears to cause issues with
-        // connection closure when it's enabled. Sometime, a peer
-        // doesn't receive the TCP/IP connection closure (RST) from
-        // the other peer and it ends up hanging. See bug #6093.
-        //
-        // public static void setTcpLoopbackFastPath(Socket socket)
-        // {
-        //     const int SIO_LOOPBACK_FAST_PATH = (-1744830448);
-        //     byte[] OptionInValue = BitConverter.GetBytes(1);
-        //     try
-        //     {
-        //         socket.IOControl(SIO_LOOPBACK_FAST_PATH, OptionInValue, null);
-        //     }
-        //     catch(Exception)
-        //     {
-        //         // Expected on platforms that do not support TCP Loopback Fast Path
-        //     }
-        // }
-
         public static void setBlock(Socket socket, bool block)
         {
             try